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@itoz itoz/ClothMotion.as
Created Feb 29, 2012

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Away3D 4.0 beta PlaneGeometryの頂点を移動し、布のゆらぎを表現 ref: http://qiita.com/items/2895
/**
* copyright (c) 2012 www.romatica.com
* @auther itoz
*/
package
{
import away3d.containers.View3D;
import away3d.core.base.SubGeometry;
import away3d.debug.AwayStats;
import away3d.entities.Mesh;
import away3d.materials.ColorMaterial;
import away3d.primitives.PlaneGeometry;
import flash.events.Event;
import flash.geom.Vector3D;
import flash.utils.getTimer;
[SWF(backgroundColor="#FFFFFF", frameRate="60", width="800", height="600")]
/**
* Away3D 4.0 beta PlaneGeometryの頂点を移動し、布のゆらぎを表現
* 動作サンプル
* @see http://dl.dropbox.com/u/958512/sample/away3d4/clothMotion/index.html
*/
public class ClothMotion extends View3D
{
private static const ZERO : Vector3D = new Vector3D(0, 0, 0);
private static const FLOW_RANGE : int = 100;
private static const FLOW_SPEED : Number = 3;
private static const RAD_VAR : Number = (Math.PI / 180);
private var _clothMat : ColorMaterial;
private var _clothGeo : PlaneGeometry;
private var _cloth : Mesh;
private var _defs : Vector.<Number>;
private var _angs : Vector.<Number>;
public function ClothMotion()
{
antiAlias = 4;
backgroundColor = 0xa1c3c0;
// ----------------------------------
// 布
// ----------------------------------
_clothMat = new ColorMaterial(0x408aa8);
_clothMat.bothSides = true;
_clothGeo = new PlaneGeometry(1024, 1024, 32, 32);
_cloth = new Mesh(_clothGeo, _clothMat);
_cloth.showBounds = true;
scene.addChild(_cloth);
// ----------------------------------
// 揺らぎ用パラメータ
// ----------------------------------
var max : int = _cloth.geometry.subGeometries[0].vertexData.length;
_defs = new Vector.<Number>(max);
_angs = new Vector.<Number>(max);
for (var i : int = 0; i < _defs.length; i++) {
_defs[i] = _cloth.geometry.subGeometries[0].vertexData[i];
_angs[i] = (360 / _defs.length * i );
}
camera.y = -1000;
addChild(new AwayStats());
addEventListener(Event.ENTER_FRAME, update);
}
/**
* アップデート
*/
private function update(event : Event) : void
{
clothMotion();
cameraMotion();
// 描画
render();
}
/**
* 布頂点ゆらぎ
*/
private function clothMotion() : void
{
var geo : SubGeometry = _clothGeo.subGeometries[0] as SubGeometry;
var vlen : int = geo.vertexData.length;
for (var i : int = 0; i < vlen;i++ ) {
_angs[i] += (_angs[i] + FLOW_SPEED >= 360) ? FLOW_SPEED - 360 : FLOW_SPEED;
var rad : Number = _angs[i] * RAD_VAR;
var flow : int = Math.cos(rad) * FLOW_RANGE;
geo.vertexData[i] = _defs[i] + flow;
}
geo.updateVertexData(geo.vertexData);
}
/**
* カメラ移動
*/
private function cameraMotion() : void
{
var range : int = 1500;
var t : Number = getTimer() / range;
camera.x = Math.sin(t) * range;
camera.y = Math.cos(t) * range;
camera.z = Math.cos(t) * range;
camera.lookAt(ZERO);
}
}
}
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